Ground connection



R. C. FISHER GROUND CONNECTION May 11 1926.

Original Filed Jan. 25. 1923 Bull Patented May 11,1926.

UNITED STATES PATENT OFFICE.

RAYMOND C. FISHER, OF ROCHESTER, NEW YORK, ASSIGNOR TO NORTH EAST ELEC- TRIO COMPANY, OF ROCHESTER, NEW YORK, A CORPORATION- OF NEW YORK.

' GROUND CONN EGTION Application filed January"25, 1923, Serial No. 614,884. Renewed October 16,1925. A

In an electrical apparatus provided with a metallic frame or casing and with an insulated binding-post, it is often desirable to rovide a connection or ground between the I hiding-post and the casing; and this is commonly done by means of a conductive bond or strap secured, at one end, to the binding-post, the other end of the strap being secured to the casing.

The objectof the present invention isto "provide a ground-connection, for the purpose just set forth, which shall be simple,ef-

fective, and neat in appearance. To this end I..use a cup-shaped conductor which is s mounted upon and concentric with the hinding-post and which spans the insulation of a the post, and makes conductiv'econtact' with the casing at its annularmar in.

, A preferred embodiment o theinvention 29 is illustrated in the accompanying drawings,

' in which Fig. 1 is a sectional elevation of a ground connection, and Fig. 2 is a bottom view of the same;

The invention is illustrated as used in con i nection with a binding- 0st 3 which is embedded in and supporte by a body 4 of insulating material. The body 4: is supported on a metal plate 5 which may constitute a part of the casing of an electrical apparatus The binding-post has the-usual threaded exwasher 9 maybe used to tremity, to which wires or terminals may be secured by nuts.

The novel grounding-device is in the form of a cup 6 drawn from sheet-metal and perforated centrally to receive the threaded 8e portion of the binding-post. This cup is preferably bent outwardly at its free margin 7 and at this point it engages the surface of the plate 5. When a nut 8 is screwed home onthe binding-post it presses the cup firmly against the plate, and a spring lockprevent accidental loosening of theparts.

It will be apparent that this grounding- -device may be very easily applied and that it requires no parts for securing it in 0perative position, other than thoseprovided for the ordinary use ofthe binding-post.

The invention claimed is:

jecting through, but insulated from, a conductive body and provided with screwthreaded fastening means, of a groundingdevice in the form of a metal cup, centrally perforated'to receive said fastening-means, the free edgeof the cup being. pressed into engagement with the surface of said conductive body, around the binding-post.-

RAYMOND 0. Fisher.

The combination, with a binding-post pro- 8D I 

